Publicaciones

@article{Oyama2018,

title = {High Genetic Diversity and Connectivity Among Populations of Quercus candicans , Quercus crassifolia , and Quercus castanea in a Heterogeneous Landscape in Mexico},

author = {Ken Oyama and Wilfrido Ramírez-Toro and Juan Manuel Peñaloza-Ramírez and Alberto Esteban Pérez Pedraza and César Andrés Torres-Miranda and Eduardo Ruiz-Sánchez and Antonio González-Rodríguez},

doi = {10.1177/1940082918766195},

issn = {1940-0829},

year  = {2018},

date = {2018-01-01},

journal = {Tropical Conservation Science},

volume = {11},

pages = {194008291876619},

abstract = {Oaxaca state is one of the main hotspots of biodiversity in Mexico, containing almost 40% of the Mexican vascular flora, due to its high variability in habitat and climatic conditions coupled with high elevations in mountains and low elevations in valleys. We studied the genetic diversity and population structure of Quercus candicans, Quercus crassifolia, and Quercus castanea across their geographical distribution in Oaxaca state to understand how the heterogeneous physiography had driven the genetic diversity and population differentiation in these three oak species. We found high levels of genetic diversity but ca. 40% of the populations had significant values of Wright’s inbreeding coefficient. The analysis of molecular variance indicated that most of the variation occurred within populations in the three oak species. Resistance analyses showed connectivity among almost all the populations but barrier analysis found genetic breaks that limited gene flow among some populations of the oak species. Even in a heterogeneous environment such as in Oaxaca state, the oak species still have high levels of genetic diversity and landscape connectivity. However, it is necessary to maintain the genetic connectivity through the preservation of natural corridors with forests in good condition, which is necessary to maintain the cohesiveness of the species in the long term. It is also important to protect the centers of species diversity in Oaxaca state located in the subprovinces of Western Oaxacan Mountains and Valleys, Sierra Madre de Oaxaca, and Sierra Madre del Sur because they harbor most of the population genetic diversity and oak species richness, as has been shown in previous studies.},

keywords = {conservation genetics, genetic connectivity, genetic diversity and structure, Mexico, Quercus},

pubstate = {published},

tppubtype = {article}

}

@article{Oyama2018b,

title = {High Genetic Diversity and Connectivity Among Populations of Quercus candicans, Quercus crassifolia, and Quercus castanea in a Heterogeneous Landscape in Mexico},

author = {Ken Oyama and Wilfrido Ramírez-Toro and Juan Manuel Peñaloza-Ramírez and Alberto Esteban Pérez Pedraza and César Andrés Torres-Miranda and Eduardo Ruiz-Sánchez and Antonio González-Rodríguez},

doi = {10.1177/1940082918766195},

issn = {19400829},

year  = {2018},

date = {2018-01-01},

journal = {Tropical Conservation Science},

volume = {11},

publisher = {SAGE Publications Inc.},

abstract = {Oaxaca state is one of the main hotspots of biodiversity in Mexico, containing almost 40% of the Mexican vascular flora, due to its high variability in habitat and climatic conditions coupled with high elevations in mountains and low elevations in valleys. We studied the genetic diversity and population structure of Quercus candicans, Quercus crassifolia, and Quercus castanea across their geographical distribution in Oaxaca state to understand how the heterogeneous physiography had driven the genetic diversity and population differentiation in these three oak species. We found high levels of genetic diversity but ca. 40% of the populations had significant values of Wright’s inbreeding coefficient. The analysis of molecular variance indicated that most of the variation occurred within populations in the three oak species. Resistance analyses showed connectivity among almost all the populations but barrier analysis found genetic breaks that limited gene flow among some populations of the oak species. Even in a heterogeneous environment such as in Oaxaca state, the oak species still have high levels of genetic diversity and landscape connectivity. However, it is necessary to maintain the genetic connectivity through the preservation of natural corridors with forests in good condition, which is necessary to maintain the cohesiveness of the species in the long term. It is also important to protect the centers of species diversity in Oaxaca state located in the subprovinces of Western Oaxacan Mountains and Valleys, Sierra Madre de Oaxaca, and Sierra Madre del Sur because they harbor most of the population genetic diversity and oak species richness, as has been shown in previous studies.},

keywords = {conservation genetics, genetic connectivity, genetic diversity and structure, Mexico, Quercus},

pubstate = {published},

tppubtype = {article}

}

@article{Figueredo2015,

title = {Genetic structure of coexisting wild and managed agave populations: implications for the evolution of plants under domestication},

author = {Carmen Julia Figueredo and Alejandro Casas and Antonio González-Rodríguez and Jafet M. Nassar and Patricia Colunga-GarcíaMarín and Víctor Rocha-Ramírez},

doi = {10.1093/aobpla/plv114},

issn = {2041-2851},

year  = {2015},

date = {2015-01-01},

journal = {AoB Plants},

pages = {plv114},

abstract = {Domestication is a continuous evolutionary process guided by humans. This process leads to divergence in characteristics such as behavior, morphology, or genetics, between wild and managed populations. Agaves have been important resources for Mesoamerican peoples since prehistory. Some species are domesticated and others vary in degree of domestication. Agave inaequidens is used in central Mexico to produce mescal, and a management gradient from gathered wild and silvicultural populations, as well as cultivated plantations, has been documented. Significant morphological differences were reported among wild and managed populations, and a high phenotypic variation in cultivated populations composed by plants from different populations. We evaluated levels of genetic diversity and structure associated with management, hypothesizing that high morphological variation would be accompanied by high genetic diversity in populations with high gene flow and low genetic structure among managed and unmanaged populations. Wild, silvicultural, and cultivated populations were studied, collecting tissue of 19 to 30 plants per population. Through 10 nuclear microsatellite loci we compared population genetics parameters. We analysed partition of variation associated with management categories to estimate gene flow among populations. A. inaequidens exhibits high levels of genetic diversity (He=0.707) and moderate genetic structure (FST=0.112). No differences were found in levels of genetic diversity among wild (He=0.704), silviculturally managed (He=0.733), and cultivated (He=0.698) populations. Bayesian analysis indicated that five genetic clusters best fit the data, with genetic groups corresponding to habitats where populations grow rather than to management. Migration rates ranged from zero between two populations to markedly high among others (M=0.73-35.25). Natural mechanisms of gene flow and the dynamic management of agave propagules among populations favor gene flow and the maintenance of high levels of variation within all populations. The slight differentiation associated with management indicates that domestication is in an incipient stage.},

keywords = {agave inaequidens, agaves, conservation genetics, domestication, genetic structure, genetic variation},

pubstate = {published},

tppubtype = {article}

}